class_docstr: Unit tests for the ``rydberg_interaction`` function.
docstr: Test that the attributes and the number of terms of the ``ParametrizedHamiltonian`` returned by
  ``rydberg_interaction`` are correct.
docstr_tok: ["Test","that","the","attributes","and","the","number","of","terms","of","the","``","ParametrizedHamiltonian","``","returned","by","``","rydberg_interaction","``","are","correct","."]
code: def test_attributes_and_number_of_terms(self):
      """Test that the attributes and the number of terms of the ``ParametrizedHamiltonian`` returned by
      ``rydberg_interaction`` are correct."""
      Hd = rydberg_interaction(
          register=atom_coordinates, wires=wires, interaction_coeff=1
      )
      settings = RydbergSettings(atom_coordinates, 1)
  
      assert isinstance(Hd, HardwareHamiltonian)
      assert Hd.wires == Wires(wires)
      N = len(wires)
      num_combinations = (
          N * (N - 1) / 2
      )  # number of terms on the rydberg_interaction hamiltonian
      assert len(Hd.ops) == num_combinations
      assert Hd.pulses == []
      assert Hd.settings == settings
  
imports: import numpy
  import pytest
  import pennylane
  from pennylane.pulse import rydberg_interaction, rydberg_drive
  from pennylane.pulse.hardware_hamiltonian import HardwareHamiltonian, HardwarePulse, AmplitudeAndPhase
  from pennylane.wires import Wires
  from pennylane.pulse.rydberg import RydbergSettings
label_desc: Use image node_id 2 for calling the TestRydbergInteraction obj's underlying member method code with example usage: obj.test_attributes_and_number_of_terms() without return types